"i am happy" in Chinese is "wo hen gaoxing"
"i feel happy" in Chinese is "wo ganjue gaoxing"
with regard to the "sad""tired" etc ,it is the same in the sentence like"wo hen shangxin""wo hen lei" , "sad" is "shangxin" in Chinese ,the "tired"is "laolei" in chinese .
i hope what i said makes you understand them. if you have any question .i am glad to answer you. Erick